CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 55,356	$ 35,647	$ 71,009	$ 116,428
Other comprehensive income (loss):
Pension and postemployment adjustment, net of tax	563	137	(9,715)	249
Foreign currency translation adjustments	16,418	(17,163)	9,300	(14,933)
Comprehensive income	$ 72,337	$ 18,621	$ 70,594	$ 101,744